Stacks!

stack_attack.rb

class Stack
  attr_accessor :stack
  
  def initialize(input)
    self.stack = input
  end

  def pop(*args)
    return stack.pop if args.empty?
    stack.pop.reverse # This shouldn't work.
  end

  def push(args)
    stack.push(args)
    true
  end

  def to_a
    stack
  end
end